装载机驱动桥主传动失效分析和可靠性增长的研究

发布时间：2019-07-10 08:56

【摘要】：主传动是装载机驱动桥上的主要传动部件,其主要功能是降低传动系的转速、增大传动系的转矩并改变转矩的方向,把纵置发动机的转矩传递到横置的两根驱动桥的半轴上,从而驱动轮毂运转。轮式装载机由于作业条件严峻,路面崎岖不平,作业时循环载荷变化很大,主传动组件很容易发生早期失效,产生传动齿的变形和折断、齿面表面疲劳、齿面磨损等,严重影响传动系统使用性能。因此有必要研究主传动失效原因,采取相应的失效改进方法,达到有效控制主传动失效和提高可靠性的目的。本文运用失效分析的方法,对主传动组件进行了失效分析,探讨了主传动组件失效机理,明确了典型的失效模式,确定了引起主传动失效的主要原因。在对主传动失效分析的基础上,根据引起主传动失效的原因,分别对主传动提出了改进设计方案：1)选用高性能材料,以满足零件的渗透性要求；2)优化和调整热处理工艺流程,改善零件表面渗碳层；3)改进零件结构、加工和装配工艺,以改善零件受力条件。按照新的设计方案进行了工艺的改进和开发,并实际装机应用,跟踪了应用情况,从实际应用效果来看,改进后的主传动外反馈指标明显下降,有效解决了动载荷冲击作用下发生的主传动早期故障问题。
[Abstract]:The main drive is the main transmission component on the drive axle of the loader. Its main function is to reduce the speed of the transmission system, increase the torque of the transmission system and change the direction of the torque, and transfer the torque of the longitudinal engine to the half shaft of the two horizontal drive bridges, so as to drive the hub to run. Because of the severe working conditions, rugged road surface and great change of cyclic load, the main transmission assembly is prone to early failure, resulting in the deformation and fracture of transmission teeth, tooth surface fatigue, tooth surface wear and so on, which seriously affects the performance of the transmission system. Therefore, it is necessary to study the failure cause of the main drive and adopt the corresponding failure improvement method to achieve the purpose of effectively controlling the failure of the main drive and improving the reliability. In this paper, the failure analysis of the main transmission assembly is carried out by using the method of failure analysis, the failure mechanism of the main transmission assembly is discussed, the typical failure mode is clarified, and the main causes of the main transmission failure are determined. Based on the failure analysis of the main transmission, according to the causes of the failure of the main transmission, the improved design schemes are put forward for the main transmission: 1) selecting high performance materials to meet the permeability requirements of the parts; 2) optimizing and adjusting the heat treatment process to improve the surface carburized layer of the parts; 3) improving the structure, processing and assembly process of the parts to improve the stress conditions of the parts. According to the new design scheme, the process is improved and developed, and the application is followed up. From the practical application effect, the external feedback index of the improved main drive is obviously reduced, which effectively solves the problem of the early fault of the main drive under the dynamic load impact.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH243

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